Total Synthesis of Novel Antibiotics Pyloricidin A, B and C and Their Application in the Study of Pyloricidin Derivatives.
作者:ATSUSHI HASUOKA、YUJI NISHIKIMI、YUTAKA NAKAYAMA、KEIJI KAMIYAMA、MASAFUMI NAKAO、KEN-ICHIRO MIYAGAWA、OSAMU NISHIMURA、MASAHIKO FUJINO
DOI:10.7164/antibiotics.55.191
日期:——
The novel natural antibiotics pyloricidin A, B and C, which possess potent and highly selective anti-Helicobacter pylori activity, were synthesized from D-galactosamine as a chiral template for the common (2S, 3R, 4R, 5S)-5-amino-2, 3, 4, 6-tetrahydroxyhexanoic acid moiety. The synthetic strategy, using 2-amino-2-deoxyuronic acid derivatives as key intermediates, was also useful to prepare a series of derivatives modified at the β-D-phenylalanine and with altered stereochemistry on the 5-amino-2, 3, 4, 6-tetrahydroxyhexanoic acid moiety. From the drastic decrease of their anti-H. pylori activity, it was clear that the β-D-phenylalanine part and the stereochemistry of the 5-amino-2, 3, 4, 6-tetrahydroxyhexanoic acid moiety were significant for the activity.
自然抗生素 pyloricidin A、B 和 C 具有强大的高选择性抗幽门螺杆菌活性,它们以D-半乳糖胺为手性模板合成,共同结构为(2S, 3R, 4R, 5S)-5-氨基-2, 3, 4, 6-四羟基己酸。使用2-氨基-2-脱氧糖酸衍生物作为关键中间体的合成策略,也有助于制备在β-D-苯丙氨酸处修饰且在5-氨基-2, 3, 4, 6-四羟基己酸部分改变立体化学的一系列衍生物。从它们抗幽门螺杆菌活性的急剧下降可以看出,β-D-苯丙氨酸部分和5-氨基-2, 3, 4, 6-四羟基己酸部分的立体化学对活性至关重要。